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Q: What is NEET?

NEET is a competitive examination conducted in India. This question is from the 2017 NEET Biology paper.

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This NEET 2017 Biology question has a medium difficulty level and is marked as an important question.

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Question

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Accepted Answer

Correct Answer: CStep-by-step Solution:Evaluating each option:Rhizobium - Alfalfa (A): Correct. Rhizobium forms nitrogen-fixing root nodules in symbiotic association with legumes. Alfalfa (Medicago sativa) is a legume, so this is a valid pairing.Frankia - Alnus (B): Correct. Frankia is an actinomycete that forms nitrogen-fixing nodules in symbiotic association with non-leguminous plants, including Alnus (alder trees).Rhodospirillum - Mycorrhiza (C): Incorrect. Rhodospirillum is a free-living, anaerobic, photosynthetic bacterium that fixes atmospheric nitrogen independently. It has no association with mycorrhiza. Mycorrhiza is a symbiotic association between fungi and plant roots, entirely unrelated to Rhodospirillum.Anabaena - Nitrogen fixer (D): Correct. Anabaena is a filamentous cyanobacterium that fixes atmospheric nitrogen in heterocysts. It also forms a symbiosis with the water fern Azolla.Why other options are incorrect:Options A, B, and D are all correctly matched pairs and are therefore not the mismatch.Key Concept:Nitrogen fixers: Symbiotic: Rhizobium (legumes), Frankia (Alnus, Casuarina), Anabaena-Azolla, Nostoc-Anthoceros. Free-living: Azotobacter, Clostridium, Rhodospirillum, Anabaena, Nostoc.Mycorrhiza: Symbiotic association between fungi and plant roots (mutualism). Not related to nitrogen fixation.

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